Improvement in lifting-pumps



UNITED STATES PATENT OEEICE FREDERICK OROCKER, OF TITUSVILLE,PENNSYLVANIA.

IMPROVEMENT IN LlFTlNG-PUM/PS.

Specification forming part of Letters Patent No. 44,610, dated October1l, 1864.

To all whom 'it may concern:

.Be it known that I, F. CROCKER, of Titus ville, Crawford county,andrState ofPennsyl- Vania, have invented a new and useful ImprovemcntinLifting-Pumps; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, making part of this specification, in which-Figure l is a vertical section, and Fig. 2 a horizontal section taken atthe line A a of Fig. 1.

The same letters indicate like parts in both iigures.

In the use of lifting-pumps, particularlyin petroleum-wells ofconsiderable depth, much inconvenience ha s heretofore been experienced.With a view to economy such wells are made with a bore of only a fewinches in diameter, just sufficient to receive the pump-barrel, theinsertion of which frequently cuts off the pressure of the atmospherefrom the surface of the liquid at the bottom, and even when such is notthe case it is necessary to introduce pack ing between the bore of thewell and the pump-barrel to shut oif what are termed surface leaksW-thatis, all foreign liquids which tend to ow into the well from sourcesabove that from which the'liquid to be pumped flows. Whenever from theseor other causes the atmospherc does not press on the surface of theliquid to be pumped, and such liquid does not rise to a sufcient heightin the well to force the liquid up in the pump-barrel below the piston,as fast or as high as the piston is lifted, as the piston begins todescend the whole col umn of water above descends with it to a greateror less extent, depending upon the dc ticiency of the hydrostaticpressure in the well to till up the space below the piston duringitsascent. In this way much power is wasted. To avoid this, lifting-pumpshave long since been made with a sustaining-valve placed above the levelof the piston when at its greatest elevation, which valve opens in anupward direction to permit the free passage ot' the column of waterduring the upward motion of the piston, and which closes to sustain suchcol umn the moment the piston begins to descend; but in such cases thissustaining-valve has been placed at the lower end of au eductionpipebranching off from the upper end of, and

of necessity by the side of, the barrel in which the piston works, thusrequiring an expensive structure, which is diflicult to get atforrepairs, and which ot' necessity requires a well of comparativelylarge bore.

The object :of my invention is to avoid all the above-namedinconveniences; and to this end my said invention consists in combiningwith the reciprocating piston of a lifting-pum p a sustaining-valveplaced above and concentric with the piston, formed with a central bore,through which and in which the pistonrod works, and having its seat inthe barrel of the pump.

In the accompanying drawings, a repreA sents a piston of any suitableconstruction for a lifting-pump, and b the piston-rod which is to beextended up to the required height, or to be connected bya link-rod withthe motive power above in any suitable manner, not nec essary to bedescribed, as this makes no part of my invention. This piston isproperly titted to work in a cylindrical barrel, c, provided at thelower end with the usual inductionvalve, d. To the upper end of thebarrel c, and concentric therewith, is a valve-seat, e, to which isproperly iitted the lower end of a sliding valve, f, and this valve hasa central bore, through which the piston-rod b passes freely butaccurately. This valve-seat e, I prefer to make separate from andproperly tted to and secured in the upper end of the pump-piston barrelc, and so formed as to eX tend above the valve, to act as a check toprevent it from being lifted too high, the part s o extended above thevalve forming at the same time a guide for the piston-rod, water-ways gbeing formed at the sides for the free passage of the liquid.

The outer periphery of the upper end of the barrel c may be tapped orotherwise secured in the usual or any appropriate manner to thepump-barrel 5 but as this, makes no part of my invention it is deemedunnecessary to represent it.

By reason of the above-described invention it will be seen that thewhole column of liquid lifted by the upward motion of the piston will besustained by the valvej'duri'ng the descent of the piston without thenecessity of using branch pipes, so that a liftingpump with asustaining-valve can be inserted and used in a Well of as small a boreas for a pump without ofthe pistou, and. has its seat in the barrel of asustaining-valve, and affording like means the pump, substantially asand for the purpose for repairs. specified.

What I claim as my invention and desire to secure by Letters Patent, isLREDERlGK CROCKER Combining with a piston of alifting-pump Witnesses: :nsustaining-valve, when such valve is placed JAMES H. ANGIER., above,concentric, and free to play on the rod J. T. CHASE.

